fix(cpus): workaround for Cortex-X4 erratum 2923985

Cortex-X4 erratum 2923935 is a Cat B erratum that applies
to all revisions <= r0p1 and is fixed in r0p2.

The workaround is to set CPUACTLR4_EL1[11:10] to 0b11.

SDEN documentation:
https://developer.arm.com/documentation/SDEN-2432808/latest

Signed-off-by: Arvind Ram Prakash <arvind.ramprakash@arm.com>
Change-Id: I9207802ad479919a7f77c1271019fa2479e076ee
(cherry picked from commit cc46166144b9a3746807f1d137ff784da3013e26)
3 files changed